What is email encryption (TLS)? A Clear Guide

TLS encrypts email in transit between servers. MTA-STS can require it, protecting messages from interception.

Why it matters

Knowing email encryption (TLS) helps you land in the inbox. See the deliverability checklist.

How Rainmail helps

Rainmail sends from your own domain on a dedicated, isolated IP with SPF, DKIM, DMARC, reverse-DNS and managed warm-up handled for you, plus a REST API and an AI watching deliverability — and it welcomes senders SES, SendGrid and Mailchimp reject, from $8. Run the free checker or see plans.